Material Recipes & Design Mixes
Cementitious Waterproofing (Two-Component) Recipe
Polymer-modified flexible cementitious coating for bathrooms, water tanks, basements and terraces under screed or tiles.
Reference standards: EN 14891, ASTM D4541 (pull-off)
| Component | Proportion | Notes |
|---|---|---|
| Powder: OPC 42.5 | 40% | Component A |
| Powder: fine silica sand 0.1–0.3 mm | 57% | Dried |
| Powder: additives (HPMC, defoamer) | ≈ 3% | |
| Liquid: acrylic / SBR polymer emulsion | Powder : Liquid = 3 : 1 by weight | Component B |
| Consumption | 1.5 kg/m² per coat, 2 coats | ≥ 2 mm total dry film |
Mixing & application
- Remove laitance, oil and loose material; fill cracks and form 50 mm cement fillets at wall–floor joints.
- Saturate the surface with water; leave damp with no standing water.
- Add powder slowly to the liquid and mix 3 minutes with a slow drill to a lump-free slurry.
- Apply the first coat by brush in one direction; embed fibre-glass mesh at corners and joints.
- Apply the second coat at right angles after 4–6 hours.
- Cure with damp hessian for 3 days; do a 48-hour ponding test before screed/tiles.
Acceptance criteria
- No leakage after 48-hour ponding test.
- Dry film thickness ≥ 2 mm, no pinholes.
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
FAQs
What is the Cementitious Waterproofing (Two-Component) Recipe used for?
Polymer-modified flexible cementitious coating for bathrooms, water tanks, basements and terraces under screed or tiles.
Which standard does it follow?
It is based on EN 14891, ASTM D4541 (pull-off). Always follow your project specification where it differs.
Can I print or submit this?
Yes. Use Print / PDF, add your project details and submit it through your normal approval process. Get it reviewed by your engineer or consultant first.
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